docstr: Load existing model from model_path
  
  :param model_path: Path to the existing model.
  :return:
docstr_tok: ["Load","existing","model","from","model_path",":","param","model_path",":","Path","to","the","existing","model",".",":","return",":"]
code: def load(self, model_path):
      """
      Load existing model from model_path
  
      :param model_path: Path to the existing model.
      :return:
      """
      raise NotImplementedError
  
file_path: analytics-zoo/pyzoo/zoo/orca/learn/spark_estimator.py
imports: from abc import abstractmethod
  from zoo.orca.learn.base_estimator import BaseEstimator
label_desc: Use image node_id 6 for calling the Estimator obj's underlying member method code with example usage: obj.load(model_path) without return types